delusion vs understanding

delusion

noun
  • The state of being deluded or misled, or process of deluding somebody. 

  • A false belief that is resistant to confrontation with actual facts. 

  • A fixed, false belief, that will not change, despite evidence to the contrary. 

  • That which is falsely or delusively believed or propagated; false belief; error in belief. 

understanding

noun
  • The act of one that understands or comprehends; comprehension; knowledge; discernment. 

  • Opinion, judgement or outlook. 

  • An informal contract; mutual agreement. 

  • A reconciliation of differences. 

  • Sympathy. 

  • Reason or intelligence, ability to grasp the full meaning of knowledge, ability to infer. 

adj
  • Showing compassion, tolerance, and forbearance. 

How often have the words delusion and understanding occurred in a corpus of books? (source: Google Ngram Viewer )